Anchor bolt



June 13, 1944, 'T NQBLE ANCHOR BOLT Filed OG'. 27, 1942 f Msn..

.ila

a 3 .I 5 8 all 8 9 Patented June 13, 1944 UNITED STATES PATENT OFFICE Thomas Noble, Quathia'ski Cavanaugh Columbia, Canada 1.

Application october 27, 1942, .serial no. 463,458:

4 Claims.A (C1. '6i-46) My invention relates to improvements in anchor bolts which are particularly adapted for use for securing caissons and other structures to rock below water level and also for providing anchorages for buoys and the like.

The invention contemplates the use of a tool `which will serve primarily as a rock drill bit to drill a hole in the rock and secondarily as th-e bolt to be secured therein thereby avoiding the necessity of locating the hole drilled in order to insert an anchor bolt therein.

The objects of the invention are to provide a device capable of being detachably secured to the end of a hollow drill rod or the chuck of a rock drill and be used as a rock drill bit, to serve as a means for admitting cement to surround and embed the device in the hole drilled thereby, and to provide means for the attachment of a chain or cable to said device for anchoring purposes, which means serve also as a head for securing structural devices to the surface of the rock drilled. A further object is to provide means and a method of accomplishing all the above mentioned objects by operations carried out above water level, thus avoiding the need for divers, and making the anchorage of devices to the sea oor w'here excessive current is encountered a relatively simple matter.

Referring to the drawing:

Fig. 1 is an elevational view of the invention connected to the chuck of a drill rod.

Fig. 2 is a sectional view.

Fig. 3 is an elevational view showing an eX- ample of the uses to which the invention may be put.

In the drawing like characters of reference indicate corresponding parts in each ligure.

The numeral I indicates generally a drill rod attached to a percussion rock drilling machine, the drill rod is provided with an axial bore 2 in the usual manner. At the lower end of the rod I a chuck 3 is provided which has a socket 4 in its lower end which is adapted to receive the shank 5 of a drill bit 6 which is intended to be left in the hole drilled and become an anchor bolt also designed by the same numeral i. e. 6. 'I'he shank 5 of the drill bit is of appropriate shape to fit the socket of the chuck and be turned thereby. Below the shank 5 a pair of spaced ilanges 8 are provided to serve as stops and retain any desired device, such for instance as a link 9, see Figure 1, to which a chain or cable I0 may be connected as an anchorage for a buoy or other device not shown. If the drill bit is to serve as an anchor bolt for the rim of a caisson or a submarine structure such as indicated in 'Figure 3, one only lian-ge may be provided. v The purpose of thev single-flange 8 or the lower ange Where two `are provided would serve to indicate to the driller when the drill bit has entered the rock to the desired depth. y

The drill bit is provided with an axial hollow bore II which is aligned with the axial bore 2 of the drill rod I and the chuck 3, but preferably of slightly smaller diameter. The lower end or face of the drill bit is star shaped as at I2 or is sharpened .in any other desired manner. In order to provide a watertight connection between the core 2. of the drill `rod and the bore II of the drill bit both recesses I3 and I4 are formed respectively in the socket 4 and in the upper end of the drill bit. The recesses are of equal diameter and are aligned and are fitted with a tubular rubber, or other resilient gasket I5 of a diameter to iit snugly against the peripheral walls of the recess. The base of the recess I4 forms a seat I6 for the reception of a ball II which is used only after the hole is drilled and the drill bit has ceased to function for drilling purposes. The drill bit is normally held connected to the chuck by a suitable spring I8 secured to said chuck and having its free end I9 extending inwardly below one of the flanges 8 of the drill bit 6.

In the example shown in Figure 3, a stanchion 20 having a anged base 2I' is to be erected on a rock foundation on the sea fioor and a stay 22 having a foot 23 is to be connected to the rock and the stanchion to brace it in position. For convenience the base 2I would be provided with an annular channel 25 and bolt holes 26 would be formed through the base and in the channel so that the driller having the stanchion supported in position on the rock could when lowering his drill bit and other equipment feel for the bolt holes with the drill bit by contacting rst the stanchion and then the channel of the flange. The foot 23 of the stay 22 is provided with a cupped recess through which a bolt hole 2l is drilled so that by sliding the end I2 of the drill bit down the brace it will feed into the recess and locate itself in the bolt hole 21.

In operation, assuming it necessary to insert an anchor bolt in the surface of a submerged rock for the purpose of attaching a mooring cable, a cable attached by the link 9 to a drill bit 6 would be mounted in the-chuck 3 and would be lowered down to the rock into which it is to be embedded. The drilling machine would be set in motion to drill the hole and Water would be forced down through the bores 2 and Il to wash out the cuttings from the hole. As soon as the drill 6 reaches the desired depth, the water connection to the drilling machine is disconnected and cement is pumped down through the drill and drill bit in sufcient quantity to properly fill the hole surrounding the drill bit and leave the bore ll also full of cement. When this is done, the ball l1. whichi preferably .of .hard rubber or lead is dropped into the bore 2" and the Water is again connected tothe drilling machine and pressure applied thereto to force the ball down onto the seat I6. The water pressure then exerted within the chuck 3 will tend to separate the chuck from the drill bit and cause the spring I8 to slip over the ange 8 of said drillbit,`so that the bit will remain embedded in cement inthe hole. The cement will then set, thus converting the drill bit into a securely fastened anchor bolt equipped with cable ready for attachment to a buoy or other` device.

AIt will be obvious that theA entire operation can be carried on from above the water level.

What I claim as my invention is:

1. The method of affixing a submarine anchor bolt which comprises boring a hole with a tubular submarine drill, washing out the cuttings from the hole by forcing water through the drill and subsequently forcing cement into the hole through said drill to embed said drill in the hole whereby said drill becomes the anchor bolt.

2. The method of aflixing an anchor bolt to a submerged rock foundation with a submarine drill and drilling machine comprising boring a hole with a tubular drill bit while forcing Water through said bit to wash out the hole, subsequently forcing cement through said drill bit' to embed said drill bit within the hole whereby the bit becomes the anchor bolt, sealing the drill bit against further cement ow and forcing the drilling machine from engaging the drill bit by water pressure applied through a part of the submarine drilling machine and against the drill bit. 3. Apparatus for drilling a hole and cementing therein a submarine anchor bolt comprising a drilling machine having a chuck, said chuck having an axial bore, a drill bit engaging with said chuck and having an axial bore, means for normally holding the drill bit in engagement with the chuck', means for rendering the connection between the drill bit and the chuck water tight, and means forclosing off the bore in the drill bit from above the chuck to disengage the drill 20 bit from the chuck.

4. The combination with a percussion drilling machine having a chuck provided with an axial passage through which water is adapted to flow, a drill bit adapted for slidable engagement with the chuck, said drill bit having a water passage aligned with the axial passage of the chuck, said chuck and bit defining at their intersection a recess, said recess extending a substantially equal distance into the chuck and into the drill bit, the base of the recess forming a valve seat and a tubular gasket adapted to exert a sealing pressure against the peripheral walls of the recess.

THOMAS NOBLE.A 

